Specifications
viii
CG635 Synthesized Clock Generator
Phase
Range ±720°
Resolution <20
ps
Maximum step size
±360°
Slew time (
¨
p > 0°)
<300 ms
Q and Q
¯ Outputs
Outputs
Front-panel BNC connectors
Frequency range
DC to 2.05 GHz
High level
–2.00 V
V
HIGH
+5.00 V
Amplitude 200
mV
V
AMPL
1.00 V (V
AMPL
Ł
V
HIGH
– V
LOW
)
Level resolution
10 mV
Level error
<1 % + 10 mV
Transition time
<100 ps (20 % to 80 %)
Symmetry
<100 ps departure from nominal 50 %
Source impedance
50
ȍ
(±1 %)
Load impedance
50
ȍ
to ground on both outputs
Pre-programmed levels
+5.0 V PECL, +3.3 V PECL, LVDS, +7 dBm, ECL
Protection
Continuous to ground, momentary to +5 V
DC
CMOS Output
Output Front-panel
BNC
Frequency range
DC to 250 MHz
Low level
-1.00 V
V
LOW
+1.00 V
Amplitude range
500 mV
V
AMPL
6.00 V (V
AMPL
Ł
V
HIGH
– V
LOW
)
Level resolution
10 mV
Level error
<2 % of V
AMPL
+ 20 mV
Transition time
<1.0 ns (10 % to 90 %, with 12pF load at far end of 50
ȍ
cable)
Symmetry
<500 ps departure from nominal 50%
Source impedance
50
ȍ
(reverse terminates cable reflection)
Load impedance
Unterminated 50
ȍ
cable of any length
Attenuation (50
ȍ
load) Output levels are divided by 2
Preprogrammed levels
V
LOW
= 0; V
HIGH
= 1.2, 1.8, 2.5, 3.3, or 5.0 V
Protection
Continuous to ground, momentary to +5 V
DC
RS-485 Output
Output Rear-panel
RJ-45
Frequency range
DC to 105 MHz
Clock output
Pin 7 and pin 8 drive twisted pair
Transition time
<800 ps (20% to 80%)
Source impedance
100
ȍ
between pin 7 and pin 8
Load impedances
100
ȍ
between pin 7 and pin 8
Logic levels
V
LOW
= +0.9 V, V
HIGH
= +2.2 V
Recommended cable
Straight-through Category-6
Protection
Continuous to ground, momentary to +5 V
DC
